Hi guys im new to the forum, but i am stumped on what to do here. I do the work on my brothers 2006 300c All Wheel Drive. I lowered the car a few inches and replaced the whole front end with new steering, suspension parts and cv shafts. The new cv shafts i put in lasted a few hundred miles...

A quick question, I had a trans service done at a dealer who charged me for 16qts of trans fluid. I was told that they used the extra 8qts to 'flush' the trans. Does this have the ring of truth or are they just lying to my face?
Thanks